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Space Forum / Shuttle / March 2008PDGF documentation/schematics ?
Does anyone know of a site that has good closeup pictures and explanations on how the arm grapples the power-data-grapple-fixture (PDGF) and where the connectors are on the PDGF ? Also, must the end effector latch on to the PDGF at a perticular rotation (so male plugs match the female plugs) or is there a mechanism that allows the end effector to connect from any rotation angle with the connectors automatically aligning themselves as the grappling is going on ? > Does anyone know of a site that has good closeup pictures and > explanations on how the arm grapples the power-data-grapple-fixture [quoted text clipped - 4 lines] > that allows the end effector to connect from any rotation angle with the > connectors automatically aligning themselves as the grappling is going on ? Go to NASAspaceflight.com >> Does anyone know of a site that has good closeup pictures and >> explanations on how the arm grapples the power-data-grapple-fixture [quoted text clipped - 7 lines] > > Go to NASAspaceflight.com Or Google. Wikipedia is a bust. http://en.wikipedia.org/wiki/Power_Data_Grapple_Fixture http://en.wikipedia.org/wiki/Dextre This PDF has some info about the PDGF (section 6.2.3): http://www.nasawatch.com/usa/USA004882.pdf The above says: Envelopes for Robotic Access and other information on the PDGF can be found in SSP 50228 Volume 15 Space Station Program Configuration and Assembly Standard Interface Control Document - Grapple Fixture Location ICD, NSTS 07700, Volume XIV, Appendix 8, Space Shuttle System Payload Accommodations Handbook - Payload Deployment and Retrieval System, and NSTS 21000-IDD-ISS, International Space Station Interface Definition Document. See Figure 6-1 below for an illustration of the PDGF. Also in section 6.2.1, there is this: The AAS vehicle shall also be equipped with a SSRMS compatible Grapple Fixture to permit robotics operation. The AAS vehicle shall comply with the requirements in NSTS 21000-IDD-ISS, Section 14 and NSTS 07700, System Description and Data Design, Vol. XIX, Appendix 8, if a FRGF or a Electrical Flight Grapple Fixture (EFGF) is used. If the AAS employs a PDGF, then the design shall comply with the requirements in SSP 42004, Mobile Servicing System to User (Generic) Interface Control Document, and SSP 42003, Space Station Manned Base (SSMB) to Mobile Servicing System (MSS) ICD. So there is a PDGF, EFGF, and FRGF. Makes you wonder if there are anymore types of grapple fixtures, doesn't it? ;-) Oh well, maybe this is a start? I'd be curious to see more about the design myself, like what the "pinout" is. Jeff  SignatureA clever person solves a problem. A wise person avoids it. -- Einstein > This PDF has some info about the PDGF (section 6.2.3): > [quoted text clipped - 30 lines] > > Jeff There is also the PVGF, which has electrical connectors like the PDGF, but is built and mounted more like the reguler FRGF which makes it cheaper but it can't be used as an SSRMS base. The EFGF is an old design that only mates (electrically and structurally) with the shuttle arm. The cost of a PDGF is quite high, so you only use those when you have to. Mike Ross >Go to NASAspaceflight.com What an assinine answer. That site That site is at best disorganized with no functional search engine. You could at least have suggested what document to look for. > <charliexmur...@yahoo.com> wrote: > >Go to NASAspaceflight.com > > What an assinine answer. That site That site is at best disorganized with no > functional search engine. You could at least have suggested what document to > look for. Yours is even more of an asinine answer 1. There is a shuttle Q&A or ISS Q&A thread to ask the question 2. The site is very organized with ISS, STS, constellation, and unmanned vehicle sections. Don't know what more would be needed. 3. The search function works very well. It is just idiot proof which I guess you must have failed the first gate >1. There is a shuttle Q&A or ISS Q&A thread to ask the question >2. The site is very organized with ISS, STS, constellation, and >unmanned vehicle sections. Don't know what more would be needed. >3. The search function works very well. It is just idiot proof which >I guess you must have failed the first gate I like NSF, but I have to agree with Glen... their Search Engine is the pits. Not as bad as, say, the useless search engine on NASA Image Exchange, but pretty weak nonetheless. Plus, unmentioned in the previous reply, the really good stuff on NSF is on L2. Prepare to empty your wallet. Brian >> <charliexmur...@yahoo.com> wrote: >>> Go to NASAspaceflight.com [quoted text clipped - 8 lines] > 3. The search function works very well. It is just idiot proof which > I guess you must have failed the first gate Oh, give me a break, Jim. The NSF search engine sucks. It is slow, frequently bombs out with obscure Microsoft OLE DB error messages, and is a lot pickier than Google on search terms. It is halfway functional for an NSF veteran trying to find old posts, if he happens to remember exact keywords from the posts. It is useless to n00bs. I get better results using Google with "site:forum.nasaspaceflight.com". > Does anyone know of a site that has good closeup pictures and > explanations on how the arm grapples the power-data-grapple-fixture [quoted text clipped - 4 lines] > that allows the end effector to connect from any rotation angle with the > connectors automatically aligning themselves as the grappling is going on ? It is a particular orientation and the docking target on the PDGF is there to ensure proper clocking |
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